/* Copyright (c) 1991 Regents of the University of California */

/* SCCSid "$SunId$ LBL" */

/*
 * Header file for modifiers using function files.
 * Include after standard.h.
 */

#include  "calcomp.h"

#define  MAXEXPR	9	/* maximum expressions in modifier */

typedef struct {
	EPNODE  *ep[MAXEXPR+1];		/* NULL-terminated expression list */
	char  *ctx;			/* context (from file name) */
	XF  *f, *b;			/* forward and backward transforms */
} MFUNC;			/* material function */

extern XF  unitxf;		/* identity transform */
extern XF  funcxf;		/* current transform */

extern MFUNC  *getfunc();	/* get MFUNC structure for modifier */